When detecting occurrence of an event for transmitting a measurement report of a radio condition of a cell at a frequency set for a base station apparatus, to the base station apparatus (3) communicating with a terminal apparatus (2), the terminal apparatus (2) in a wireless communication system (1) creates a measurement report including information indicating radio conditions of cells at a frequency at which the event occurred and at another different frequency. The base station apparatus (3) controls whether or not to perform handover of the terminal apparatus (2) to another cell, on the basis of the measurement report transmitted from the terminal apparatus (2). Thereby, there is provided a wireless communication system in which a base station apparatus and the terminal apparatus are communicable with each other using multiple frequencies, the wireless communication system being capable of shortening time required for handover.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A terminal apparatus comprising: a transceiver, which, in operation, communicates with a base station apparatus; and control circuitry coupled to the transceiver, wherein the control circuitry, in operation, detects occurrences of an event in a cell among multiple cells including both serving cells, which are aggregately used by the transceiver to communicate with the base station apparatus on serving frequencies, and non-serving cells, which are not presently used by the transceiver to communicate with the base station apparatus; measures radio conditions of the serving cells and the non-serving cells; and in response to detection of an occurrence of the event, creates a measurement report indicating radio conditions of the best non-serving cell selected from the non-serving cells based on reference signal received power (RSRP) on one of the serving frequencies, the measurement report excluding radio conditions of non-selected non-serving cell(s) for which the radio conditions are measured; and transmits the measurement report to the base station apparatus.
2. The terminal apparatus according to the claim 1 , wherein the measurement report includes a list of the best non-serving cells in order of decreasing RSRP.
3. The terminal apparatus according to claim 1 , wherein a policy for deciding the multiple cells, for which radio conditions are measured, is set in the terminal apparatus.
4. The terminal apparatus according to claim 1 , wherein the best non-serving cell is a cell judged to have a higher RSRP in comparison with a reference RSRP.
5. The terminal apparatus according to claim 1 , wherein the measurement report additionally indicates radio conditions of the serving cells on the serving frequencies.
6. The terminal apparatus according to claim 1 , wherein the serving frequencies include a primary frequency and a secondary frequency, wherein the control circuitry, in operation, determines whether to create the measurement report additionally indicating radio conditions of a cell on the primary frequency, or to create the measurement report additionally indicating radio conditions of the cell on the primary frequency and of a cell on the secondary frequency.
7. The terminal apparatus according to claim 5 , wherein the radio conditions of the serving cells and of the best non-serving cell are combined in one measurement report.
8. A wireless communication method comprising: a terminal apparatus communicating with a base station apparatus; the terminal apparatus detecting occurrences of an event in a cell among multiple cells including both serving cells, which are aggregately used by the transceiver to communicate with the base station apparatus on serving frequencies, and non-serving cells, which are not presently used by the transceiver to communicate with the base station apparatus; the terminal apparatus measuring radio conditions of the serving cells and the non-serving cells; the terminal apparatus, in response to detection of an occurrence of the event, creating a measurement report indicating radio conditions of the best non-serving cell selected from the non-serving cells based on reference signal received power (RSRP) on one of the serving frequencies, the measurement report excluding radio conditions of non-selected non-serving cell(s) for which the radio conditions are measured; and the terminal apparatus transmitting the measurement report to the base station apparatus.
9. The method according to the claim 8 , wherein the measurement report includes a list of the best non-serving cells in order of decreasing RSRP.
10. The method according to claim 8 , wherein a policy for deciding the multiple cells, for which radio conditions are measured, is set in the terminal apparatus.
11. The method according to claim 8 , wherein the best non-serving cell is a cell judged to have a higher RSRP in comparison with a reference RSRP.
12. The method according to claim 8 , wherein the measurement report additionally indicates radio conditions of the serving cells on the serving frequencies.
13. The method according to claim 8 , wherein the serving frequencies include a primary frequency and a secondary frequency, wherein the method further comprises the terminal apparatus determining whether to create the measurement report additionally indicating radio conditions of a cell on the primary frequency, or to create the measurement report additionally indicating radio conditions of the cell on the primary frequency and of a cell on the secondary frequency.
14. The method according to claim 8 , wherein the radio conditions of the serving cells and of the best non-serving cell are combined in one measurement report.
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January 9, 2014
May 24, 2016
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